Hi Milan and Pete,
Thank for your reply. Today, Jun 21, 2021, I read @milan 's. I was able to login to this forum. I was also able to open www.fsuipc.com.
So, I thought: everything is OK. When I wrote my answer here in this forum to you, at the moment I pushed the button "Submit Reply", the Edge browser popped up that warning page as I uploaded on June 6. Then I removed the cookies from this forum and from simMarket. Then, from within a cmd session I issued the ipconfig ... command. Rebooted the desktop PC and also rebooted the router from my isp. After having internet again and my desktop PC had been rebooted, I tried again: logged into this forum, visited fsuipc.com. All OK, but at the time I wanted to send another reply in this forum I got again the warning page in Edge. Now I started a 2nd Windows PC that I have here. I logged into this forum OK. I called up the fsuip.com page. The page opened but with a warning on the address line saying (in Portuguese language) "not safe" See the screen shot. But the page of this forum shows the "lock", so that's OK. Also opening fsluip.com using the Chrome browser gives the "not safe" warning.
So far my reply.
Greetings,
Paulus